EctodermMesodermEmbryonic InductionGastrulaGene Expression Regulation, DevelopmentalBody PatterningEmbryo, NonmammalianXenopus ProteinsSomitesIn Situ HybridizationMorphogenesisChick EmbryoBone Morphogenetic ProteinsFetal ProteinsHomeodomain ProteinsNervous SystemXenopusGastrulationBone Morphogenetic Protein 4T-Box Domain ProteinsZebrafish ProteinsXenopus laevisTranscription FactorsFibroblast Growth FactorsNodal ProteinNeural CrestGerm LayersZebrafishGenes, HomeoboxCell DifferentiationQuailActivinsFibroblast Growth Factor 8ExtremitiesSignal TransductionWnt ProteinsLimb BudsEmbryonic and Fetal DevelopmentGoosecoid ProteinCoturnixBlastulaEndodermTissue TransplantationCell LineageSea UrchinsEmbryonic DevelopmentMolecular Sequence DataDrosophilaNodal Signaling LigandsNeural PlateDrosophila ProteinsBranchial RegionHeadEmbryo, MammalianDNA-Binding ProteinsTrans-ActivatorsHedgehog ProteinsPaired Box Transcription FactorsChimeraBase SequenceTwist Transcription FactorBlastodermInhibinsAmino Acid SequenceCentral Nervous SystemBone Morphogenetic Protein ReceptorsTailProteinsAvian ProteinsBasic Helix-Loop-Helix Transcription FactorsTransforming Growth Factor betaReceptors, Fibroblast Growth FactorVisceraOtx Transcription FactorsRepressor ProteinsWnt1 ProteinAnimals, Genetically ModifiedEmbryonic StructuresGenes, InsectPrimitive StreakEmbryonic Stem CellsRNA, MessengerWnt3 ProteinLeft-Right Determination FactorsCulture TechniquesModels, BiologicalFibroblast Growth Factor 4BlastocystCell MovementHMGB ProteinsRhombencephalonStem CellsSequence Homology, Amino AcidMutationGene ExpressionHeartChordata, NonvertebrateMicroinjectionsMyogenic Regulatory Factor 5Vertebrates